生物质碳材料的孔道分析  

Pore Analysis of Biomass Carbon Materials

作　　者：陈佩丽[1] 陈晓丽[1] 卢思 王树加 苏秋成[1] CHEN Peili;CHEN Xiaoli;LU Si;WANG Shujia;SU Qiucheng(Guangzhou Institute of Energy Conversion,Chinise Academy of Sciences,Guangzhou,Guangdong 510640,China)

机构地区：[1]中国科学院广州能源研究所,广州510640

出　　处：《中国无机分析化学》2024年第4期473-478,共6页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家自然科学基金面上项目(51976222,52276219)。

摘　　要：生物质碳材料的孔道类型和孔径大小制约着材料有效的活性位点数量,影响材料的性能。孔道分类又是孔径分析的前提条件,因此,建立孔道分类的方法非常有意义。随着生物质碳材料的深入研究,研究者对其孔道分析的要求逐渐提高。由于实际的吸脱附等温线具有不规则性,难以匹配IUPAC规范中的吸脱附等温线,所以,用实际的吸脱附等温线与IUPAC规范中的吸脱附等温线进行匹配对生物质碳材料的孔道进行分类准确度不能得到保证。使用自制生物质碳材料,运用物理吸附仪对其进行表征,采用BET方程(Brunauer-Emmett-Teller)、T-plot方法(Thickness-plot)、DFT方法(Non-local Density Functional Theory)、BJH(Barrett Joyner And Halenda)方法对其孔道进行分析。研究表明,采用孔隙率和比表面积占有率对其进行孔道分类,可以准确地定义出微孔生物质碳材料、介孔生物质碳材料和微介孔生物质碳材料,从而建立了孔隙率和比表面积占有率的孔道分类新方法。用标准样品对孔隙率和比表面积占有率的孔道分类新方法进行论证,结果一致。方法准确可靠、实用性高。The effective active site number of biomass carbon is affected by its pore type and pore size.The activity of biomass carbon is also effeted by its pore type and pore size.The prerequisite of pore size analysis is pore type.Therefore,it is very meaningful to establish the method of pore classification.With the in-depth study of biomass carbon materials,the analysis of pore is more and more accurate which is what researchers need.Because the actual adsorption desorption isotherm is irregular.It is difficult to match the IUPAC adsorption and desorption isotherm.Therefore,the pores of biomass carbon materials are classified by matching the actual adsorption desorption isotherm with the IUPAC adsorption desorption isotherm,and the accuracy of which cannot be guaranteed.The biomass carbon materials were prepared and characterized by N 2-adsorption.The pores of the biomass carbon materials were analyzed by the BET equation(Brunauer-Emmett-Teller),T-plot(Thickness-plot)method,DFT(Non-local Density Functional Theory)method,and BJH(Barrett Joyner and Halenda)method.The result show that the biomass carbon can accurately defined microporous materials,mesoporous materials,and micro mesoporous materials by porosity and specific surface area occupancy.Thus,a new method for pore classification of porosity and specific surface area occupancy is established.The new method for pore classification of porosity and specific surface area is verified by standard samples,and the results are consistent.So the new method for pore classification based on porosity and specific surface area occupancy is accurate,reliable,and highly practical.

关 键 词：生物质碳 孔道分类 孔隙率 比表面积占有率 

分 类 号：O657.31[理学—分析化学] X832[理学—化学]